Isuzu KB P190. Manual — part 1006

7A2-58 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

Step Action Value(s)

YES

NO

9

1. Reconnect all previously disconnected harness

connector(s).

2. Clear the DTCs with a scan tool.

3. Turn “OFF” the ignition.

4. Start the engine.

5. Operate the vehicle within the Conditions For

Running the DTC. You may also operate the
vehicle within the conditions that you observed
from the Freeze Frame/ Failure Records.

Did the DTC fail this ignition?

— Go

to

Step 2 Go

to

Step 10

10

Observe the stored information, Capture Info with a
scan tool.

Are there any DTCs that you have not diagnosed?

— Go

to

Diagnostic

Trouble Code

(DTC) List

Verify repair

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-59

DTC P0722 (Flash Code 11)

RTW77AMF000701

Circuit Description

Vehicle speed information is provided to the TCM by the
output revolution sensor. This sensor is located in the
transmission adapter or extension housing.

The output revolution sensor is an electromagnetic
pulse pickup type that generates a speed signal
according to the revolution of the transmission output
shaft. As a result, the sensor sends a sine wave signal
(AC) to the TCM, which converts this sine wave signal
(pulse voltage) to a RPM signal.

Condition For Running The DTC

All of the following conditions are met.

(1) All of the following conditions are met for 2

seconds ore more continuously.

• The supply voltage is more than 10.2 volts and

less than 15.5 volts.

• DTC U2104 is not detecting failure or not

deciding failure.

• DTC U2105 is not detecting failure or not

deciding failure

• Engine revolution sensor is not detecting failure

or not deciding failure.

• The engine revolution is more than 550rpm.

(2) Not emergency mode.

(3) All of the following conditions are met.

• Device Control is not operating.

• Disable Normal Communication Service is

receiving enable.

• DTC Clear is not operating.

Condition For Setting The DTC

All of the following conditions are met.

(1) 25 seconds or more passed after changing to the

except P/R/N from P/R/N.
If the following condition is met when 25 seconds
or more passed after changing, it is considered
that 25 seconds or more passed.

• Oil temperature sensor is not detecting failure or

not deciding failure, and also oil temperature is
more than 20

°C (68°F).

7A2-60 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

(2) Select position switches is not detecting failure or

not deciding failure.

(3) Input revolution sensor is not detecting failure or

not deciding failure.

(4) Output revolution calculated by input revolution is

more than 300rpm.

(5) If input revolution signal pulse count is more than

13 ×500, any pulse is not detected from output
revolution sensor.

Action Taken When The DTC Sets

• The TCM uses input speed sensor as a vehicle

speed.

• No squat control.

• No torque reduction control.

• No line pressure control.

• No use 4th gear.

• No lock-up control.

• No reverse lock out control.

• No slope control.

• Control gear change by calculating vehicle speed

from input revolution sensor.

• No coast control.

• No input revolution sensor failure detection.

• Keep oil temperature sensor open failure detection

accumulated timer.

• No select position switch (OPEN) failure decision.

• No T/F Hi-Low SW failure detection.

• No shift solenoid functional failure detection.

• No L-up solenoid functional failure detection.

• No lockup “OFF” control at fuel cut.

• Check Trans “ON”.

• DTC stored.

• MIL request “ON”. (EURO 4 only)

Conditions For Clearing The DTC

• The DTC can be cleared from the TCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warm-up cycles without a
failure reported.

• After more than 1 second has elapsed after the

ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring.

Inspect for a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while
observing test equipment for a change.

• Check output revolution sensor for proper mounting

and adjustment.

Circuit/System Testing DTC P0722

Step Action Value(s)

YES

NO

1

Was the On-Board Diagnostic (OBD) System check
performed ?

— Go

to

Step 2

Go to OBD

system check

2

1. Install a scan tool.

2. Turn on the ignition.

3. Review and record scan tool data.

4. Operate the vehicle within scan tool data.

Does a scan tool indicate DTC P0722?

— Go

to

Step 3

Refer to

Diagnostic Aids

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-61

Step Action Value(s)

YES

NO

3

Measure the voltage of the output revolution sensor
by the 5-8840-0285-0 DMM.

1. Turn “OFF” the ignition.

2. Lift the driving wheels.

3. Disconnect the output revolution sensor connector.

4. Turn “ON” the ignition with engine idling in gear.

5. Measure the voltage between the output revolution

sensor connector terminal E109-1 and E109-2.

Does the DMM indicate specified value?

About 3V

Go to Step 6

Go to Step 4

4

Measure the resistance of wire by the 5-8840-0285-0
DMM.

1. Turn “OFF” the ignition.

2. Disconnect the TCM connector.

3. Connect the output revolution sensor connector.

4.

Measure the resistance between the TCM
connector terminal C95-5 and C95-14.

Does the DMM indicate specified value?

560

∼

680

Ω

(20

°C/68°F)

Go to Step 7

Go to Step 5

5

Measure the resistance of output revolution sensor by
the 5-8840-0285-0 DMM.

1. Turn “OFF” the ignition.

2. Disconnect the output revolution sensor connector.

3.

Measure the resistance between terminals at
output revolution sensor side connector E109-1
and E109-2.

Does the DMM indicate specified value?

560

∼

680

Ω

(20

°C/68°F)

Go to Step 8

Go to Step 6

6

Replace the output revolution sensor.

Is the action complete?

— Go

to

Step 9 —

7

Replace the TCM.

Important:

The replacement TCM must be

programmed. (Refer to SPS for procedure.)

Is the action complete?

— Go

to

Step 9 —

8

Check the wire between terminal C95-5 and E109-1
or C95-14 and E109-2.

1. Connect the 5-8840-0285-0 DMM to the each the

TCM connector and output revolution sensor.

If the problem found repair as necessary.

Was the problem found?

— Go

to

Step 9 —